Process of making paper bags.



C. F. SMITH. PROUBSS OF MAKING PAPER BAGS. APPLICATION FILED P111114, 1912.

Patented Oct. 15, 1912.

COLUMBIA PLANOGRAPH CD..WA$HINC|TON. D. C.

"UNIT STATES FATE FFIE CHARLES F. SMITH, OF BRIDGEPORT, CONNECTICUT, ASSIGNOR TO HOWLAND BAG AND PAPER COMPANY, OF DEXTER, NEW YORK, A CORPORATION OF NEW YORK.

PROCESS OF MAKING PAPER BAGS.

incisor.

Specification of Letters Patent.

Application filed February 14, 1912.

To all whom it may concern:

Be it known that I, CHARLES F. SMITH, a citizen of the United States, and a resident of Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in the Process of Making Paper Bags, of which the following is a specification.

This invention relates to the process of making paper bags and particularly to the formation of the diamond fold for the bottom of self opening square paper bags.

The object of my improved process is to provide a method at once simple and efficient, and which can be practiced athigh speed without deranging or mutilating the blank.

The apparatus for carrying out my improved process may have various embodiments and inthe drawings accompanying this specification I have illustrated simple elementary characteristic features of one such apparatus.

The blank best adapted for the practice of my improvements is of well known character, of flat tubular form having opposite inwardly folded tucks in the sides thereof respectively and the diamond fold is formed in one end thereof called the forward end because it is customary to advance the blank in the direction of its length during the practice of the process.

Figures 1 to 6 are diagrammatic side elevations illustrating successive steps in my process and Fig. 7 is a diagrammatic plan view showing the completed diamond fold.

While any one of a variety of foldingbeds may be employed in the practice of my improvements I preferably use the well known rotary cylindrical folding-bed 5 having a transverse shaft 6 pivoted therein with its axis tangent to said bed. Said shaft is cut away on one side at its middle portion to about its axial line and has secured there to and extending forwardly therefrom a plate 7 conforming in its normal position with the cylindrical face of folding-bed 5. When said shaft 6 is rotated in an anticlockwise direction plate 7 is turned over backwardly from the position of Figs. 1 and 2 to the position of Fig. 3; and if said shaft is thereafter rotated in a clockwise direction said plate will be turned over forwardly from the position of Fig. 3 to the position of Fig. 4 which position of Fig. 4C is the same as the original position of Figs. 1 and 2. Said turnover plate 7 is provided with side clips 8, 9 having their defining edges 10, 11 coincident with the lines of the forward angular folds 12, 13 respectively.

At a distance rearwardly of shaft 6 equal to the distance forwardly thereof of clips 8, 9 are opposite side clips 14, 15 for coaction with the rearward fixed portion of folding-bed 5. Said clips 14:, 15 have their defining edges 16, 17 coincident with the lines of the rearward angular folds 18, 19 respectively.

For turning inwardly the sides of the box shape I provide opposite fixed fingers as 20. For folding down the forward end of the diamond fold I preferably employ a rotary blade 21 pivotally mounted at 22 and which may be rotated in an anti-clockwise direction in coaction with the passing foldingbed thereunder. Said blade delivers the forward end of the bag blank into the general plane or curve of the bag blank and into the grip of front clip 24. conveniently pivoted at 25 under folding-bed 5.

For folding down the rearward end of the diamond fold I preferably employ blade 23 also pivotally mounted preferably coaxially with blade 21 at 22. To supplement the action of blades 21 and 23 I may employ if desired one or more ironing blades 26 of well known character and function.

My improved process is practiced as follows: A tubular blank 27 having opposite inwardly folded tucks as 28 may be previously supplied with the usual main transverse crease 29 bysome convenient means such as rotary creasers 3, 4t and delivered over table 2 to folding-bed 5. Said transverse crease 29 is not essential to the prac tice of my process but I have found that some papers fold with greater precision after such creasing. Said bag blank is de livered onto said folding-bed with crease 29 in line with the axis of shaft 6 and side clips 8, 9 enter side tucks as 28 respectively and grip the opposite lower plies thereof to turnover plate 7, Fig. 2. Shaft 6 and plate 7 are then rotated in an anti-clockwise direction from the position of Fig. 2 to that of Fig. 3, whereby the forward end of the bag blank is turned over backwardly on the line of the main transverse crease onto the body of the blank. Directly thereafter side clips 14, 15 enter opposite side tucks as 28 respectively and grip the upper plies thereof to the body of the blank and both to the rearward fixed portion of folding-bed 5, Fig. 3. Then shaft 6 and plate 7 rotate in a clockwise direction, forwardly to their original position, Figs. 2 and 4. In so turning forwardly said plate 7 takes with it the lower plies of the bag blank as the opposite lower plies of the side tucks are gripped thereto by side clips 8, 9. This results in opening up the forward end of the blank into box shape, Fig. 4. I may then, if desired, turn inwardly the sides of the box shape by opposite fingers as 20 to facilitate the next steps of folding the front and rear ends of the diamond fold. By rotating blade 21 in the direction of its arrow I fold down the forward end of the diamond and deliver it into the general plane of the blank and into the grip of front clip 24, Fig. 5. Then by rotating blade 23 at about the same speed as that of folding-bed 5 I fold down the rearward end of the diamond, Fig. 6. I then preferably iron down the diamond folded blank by passing it under blades as 26. Then by withdrawing clips 8, 9, 14:, 15 and 24 the completed diamond folded bag blank is free for removal.

I claim:

1. The combination of those steps in the process of forming the diamond fold in a tubular. bag blank having opposite inwardly folded tucks in the sides thereof respectively, comprising gripping the opposite lower plies of the side tucks near the forward end of said blank, turning over backwardly that forward end on the line of the main transverse crease, gripping the upper plies of the side tucks and turning over forwardly the previously gripped. lower plies, thereby opening the forward end of the blank into box shape.

2. The combination of those steps in the process of forming the diamond fold in,a tubular bag blank having opposite inwardly folded tucks in the sides thereof respectively, comprising gripping the opposite lower plies of the side tucks on the line of the angular folds respectively, turning over backwardly the forward end of the bag blank on the line of the main transverse crease, gripping to the body of the blank the upper plies of the side tucks on the line of theangular folds respectively and turn comprising gripping the opposite lower plies of the side tucks near the forward end of said blank, turning over backwardly that forward end on the line of the main transverse crease, gripping the upper plies of the side tucks to the body of the blank, turning over forwardly the previously gripped lower plies, thereby opening the forward end of the blank into box shape, turning inwardly the sides of saidbox shape, folding down the forward end of the diamond fold, holding that forward end in the general plane of the bag blank and folding down the rearward end of the diamond fold onto the bag body.

1. The combination of those steps in the process of forming the diamond fold in a tubular bag blank having opposite inwardly folded tucks in the sides thereof respectively, comprising gripping the opposite lower plies of the side tucks on the line of the angular folds respectively, turning over backwardly the forward end of the bag blank on the line of the main transverse crease, gripping to the body of the blank the upper plies of the side tucks on the line of the angular folds respectively, turning over forwardly the previously gripped lower plies, thereby opening the forward end of the blank into box shape, folding down the forward end of the diamond fold and folding down the rearward end of the diamond fold onto' the bag body.

5. The process of forming the diamond fold on a tubular bag blank having opposite inwardly folded tucks in the sides thereof, including-in combination, turning over backwardly the forward end of said blank on the line of the main transverse crease, and folding said forward end down backwardly onto the body of the blank, holding in their folded back positions those plies which were originally upper plies but which now lie down against said body, and then turning over forwardly those plies which were originally lower plies but which now lie uppermost, thereby opening the forward end of the blank.

6. The process of forming the diamond fold on a tubular bag blank having opposite inwardly folded tucks in the sides thereof, including in combination, turning over backwardly the forward end of said blank on the line of the main transverse crease and folding said forward end down backwardly onto the body of the blank gripping each of the opposite upper and lower plies of the side tucks to hold said 13th day of February, 1912, before two subupper plies in theilr foldeld baokd position; scribing witnesses.

and turning over orwa-r ly sai rippe lower plies thereby opening the forwird end CHARLES SMITH' of the blank into box shape.

Signed at New York, in the county of New York and State of New York, this Witnesses:

LA FoY G. BARBER, CHAS. WV. LA RUE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

